how to determine network device names

[Little Girl]

Hey there,

hput via ubuntu-users wrote:

>ubuntu 21.04    
>I read that one can determine the possible name of a network device
>by using 'lspci'

[SNIP]

>It seems like I should be able to piece together an enpxxx type
>device name by extrapolating from those examples:
>
>I came up with `enp3s0' but of course when I try that with ifconfig.
>
>  ifconfig enp3s0
>
>I just get `error fetching interface information ... device not
>found'

Yep. That's no longer used. I've got a couple of options for you
below, although neither of them uses lspci.

This command will give it to you:

ip address | grep "BROADCAST" | cut -d' ' -f2 | cut -d':' -f1

How the command works:
	* The ip address command gets your network configuration and
	  passes it to the grep command.
	* The grep command finds a line of  content containing the
	  "BROADCAST" search term. It passes its findings to the first
	  cut command.
	* The first cut command removes all but the second field,
	  which is your iface plus a colon after it. It passes its
	  result to the next cut command.
	* The next cut command removes all but the first field, so it
	  removes the colon, which leaves you with your iface.

This command will also give it to you:

ip route | grep kernel | cut -f2 -d'/' | cut -f3 -d' '

How the command works:
	* The ip address command gets your network routing table and
	  passes it to the grep command.
	* The grep command finds a line of content containing the
	  "kernel" search term. It passes its findings to the first
	  cut command.
	* The first cut command splits the input at forward
	  slashes and removes all but the second field, which
	  contains space-separated data. It passes its result to the
	  next cut command.
	* The next cut command splits the input at spaces and removes
	  all but the third field, which leaves you with your iface.

-- 
Little Girl

There is no spoon.